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  1. Engine/EFI/Drivetrain
    I'm trying to mess with my procom and get rid of this mid-rpm stutter. From 5-7k rpm it bogs, stutters and pops and idk what to do to tune it out. Little history... Last year around October i sent my quad to a guy to work on it- port & polish, stage 2 hot cams, JE 12.8 piston. Soon as he has...
  2. Member Introductions
    i have a 08 kfx 450r with a yoshi comp full exhaust, k&n air filter, and everything else is stalk. a buddy and i went out riding and once the engine got warm i noticed it cutting out, and sputtering. once i got past half throttle it would come out of it and run fine. i stopped and it was still...
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